Liu Hai is the immortal associated with commercial success. He is nearly always portrayed with his three-legged toad and cash, and conveys a wish for prosperity. The three-legged toad itself has origins in the magical realm, representing the unattainable. It was only in later Chinese art that it was associated with Liu Hai.
There are many versions of the story of Liu Hai and his toad companion, but the essential elements remain that as a reward for his friendship, the toad revealed the secret to eternal life. Holding the toad also allowed Liu Hai to travel anywhere in the world instantaneously.